Give comparison between C₃ and C₄ pathways.

Solution

C₃pathways		C₄pathways
1.	The primary acceptor of CO₂ is RUBP – a six-carbon compound.	1.	The primary acceptor of CO₂ is phosphoenol pyruvate – a three-carbon compound.
2.	The first stable product is 3-phosphoglycerate.	2.	The first stable product is oxaloacetic acid.
3.	It occurs only in the mesophyll cells of the leaves.	3.	It occurs in the mesophyll and bundle-sheath cells of the leaves.
4.	It is a slower process of carbon fixation and photo-respiratory losses are high.	4.	It is a faster process of carbon fixation and photo-respiratory losses are low.
5.	Occurs in all the plants	5.	Occurs only in C_{4 plants}

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